Healthy Blueberry Crumble Bars Recipe

These easy Blueberry Crumble Bars are made vegan and gluten-free for the ultimate breakfast recipe! Imagine fresh blueberries on a gluten-free, oatmeal crust and more of that crust served as a top layer crumble! This will be your favorite Oatmeal Bars recipe! Make easy Blueberry Bars for breakfast or dessert!

A blueberry crumble bar sits on a plate with lots of blueberries around it.
Blueberry Oat Crumble Bars are made with fresh blueberries!

Magical Vegan Blueberry Crumble Bars

Blueberry bar recipes are so perfect in summer, but they can be enjoyed any time of year. These blueberry oat bars make my summers better, though, because otherwise I have to face the lawn mowers alone.

You know hot that goes, right? You go outside to enjoy a peaceful day in the summer — maybe to enjoy some time in the hammock or porch swing…read a good book — and boom! Out comes the lawn mowers!

Sometimes? I think they’re waiting for me. Because it’s all quiet until I get all settled in outside. It’s a little like Bugs Bunny stepping out onto the road. You know the one I’m talking about? No cars in site until he dips his toe on the road and suddenly cars are speeding by.

That’s me and lawn mowers and my back yard.

I guess that’s why we have earbuds. Amiright? 🤗

How do you make freeze-ahead blueberry crumble bars?

To freeze blueberry crumble bars, make the bars, bake them, and let them cool completely. Freeze the entire batch or individual slices by storing in a freezer-safe container or freezer bags. They will keep up to 3 months when properly stored in the freezer.

How do you store blueberry crumble?

Any leftover blueberry crumble slices can be stored in an airtight container or wrapped in plastic wrap. It will keep 3 – 4 days at room temperature or up to 8 days in the fridge.

Fresh blueberries sit in the bottom of a pot ready to be placed on the stove.

Blueberry Sauce

I begin these blueberry dessert bars with fresh blueberries. You can use frozen if you’d like, and depending on the time of year, frozen may be the best option. For example, in the winter months when fresh blueberries are more expensive, frozen will work just fine.

Here are the ingredients in the blueberry part of blueberry bars recipes:

  • blueberries
  • water
  • agar agar flakes
  • lemon juice
  • agave nectar

Simply bring these ingredients to a boil, cook for a few minutes and transfer to a bowl and refrigerate. Soon you’ll have a nice, thick blueberry sauce!

Wait. Did I lose you with the agar flakes? I hope not! Because agar agar flakes are so easy to work with. Imagine it like the gelatin of the sea! You don’t need to use gelatin because agar agar flakes work the exact same way!

It’s pretty easy to buy agar agar flakes too. You can find them at health food stores, like Sprouts or Natural Grocers. And, then there’s Amazon. I was able to buy 3 packages of agar agar flakes on Amazon for a relatively affordable price there.

I’m trying to keep these blueberry bars healthy which is why this recipe is calling for pretty minimal sweetener.

Note: Add a teaspoon of lemon extract to the filling to make lemon blueberry crumble bars

Dry ingredients and wet ingredients on separate sides of a white bowl.

How do I make a blueberry crumble?

There are lots of ways to make a blueberries bar crumble, but the basic idea is to combine flour, sugar, and fat so that it’s thick, like cookie dough. Typically this is used to create a crust topped with a filling and additional crumble baked on the top.

For today’s healthy blueberry oatmeal crumble bars recipe, I’m going gluten-free and all healthy on you! But don’t tell anyone, because these taste SO good, no one will realize they’re actually healthy!

This delicious gluten-free crumble is really like a blueberry shortbread and is made with the following ingredients:

  • oats
  • almond meal
  • ground flax seeds
  • baking powder
  • salt
  • applesauce
  • agave nectar
  • almond butter
  • plant-based milk
  • vanilla
  • apple cider vinegar

That’s it! As I said, I’m trying to keep these blueberry bars easy! That’s one reason I begin by combining the dry ingredients in a mixing bowl. Next, I scoot those dry ingredients to one side and mix the wet ingredients on the other half of the bowl. Then gradually stir it all together.

Finally, press about three quarters of the mixture into the bottom of a square baking dish sprayed with vegetable spray.

The batter for oatmeal bars is pressed into the bottom of a square baking pan.
Blueberry Squares begin with a crispy crust at the bottom.

Healthy Berry Crisp

What makes these berry crumble bars healthy? First of all, they’re free of white, refined sugar. That’s great news because it’s good to keep an eye on that. We’re learning every day about the importance of reducing refined white sugars in our diets. I used agave nectar in this recipe. It’s affordable and agave nectar has been shown to be more beneficial than sugar.

In addition to the type of sweetener used, I also kept it pretty minimal. In fact, if you have a sweet tooth, you may be inclined to increase the sweetness in this recipe just a tad to meet your needs.

I find sweetness to be one of those things that is quite variable from person to person. Thus the saying, “One person’s raisin is another one’s candy.”

Something like that!

Also, this recipe is made with healthy fats, like almond butter and even the almonds from the almond meal adds healthy fats to this recipe.

Finally, there’s just lots of great healthy ingredients in this blueberry squares recipe, like applesauce and oats that add fiber, nutrients, and the right ingredients to give this crumble texture and flavor!

If you love healthy, berry-infused sweets, check out my Blackberry Banana Chia Pudding! I know. It’s amazing!

A baking dish full of blueberry crumble bars sits next to a bowl of fresh blueberries.
Blueberry Crisp Bars are so delicious!

Gluten Free Berry Crisp

I made this blueberry crumble recipe gluten-free by skipping out on the wheat flour. You know, I could have used a whole wheat pastry flour, but I thought using oatmeal would be a nice touch.

In addition, I used almond meal to add healthy fats and additional texture to the bar part of this recipe.

I’m not picky about where I buy my oats because I don’t have celiac. Oatmeal in and of itself is gluten-free, but sometimes it can be processed in facilities where gluten products are also produced.

If you’re highly sensitive to gluten, you will want to buy oatmeal that’s certified gluten-free.

Alternatively, here’s a Vegan Lemon Bars recipe that is not gluten-free. You know. So you have options!

A slice of oatmeal blueberry bars sits in the foreground with another slice behind it.
This Blueberry Crumbles Bars recipe is easy to make!

We hope you love this recipe for Blueberry Crumble Bars! We sure did! If you decide to make it, be sure and snap a photo and share it with me using #namelymarly on Instagram. I love seeing your photos!

A blueberry oatmeal bar sits on a white plate with lots of blueberries around it.

Blueberry Oatmeal Crumble Bars

These Blueberry Oatmeal Crumble Bars make a delicious breakfast with health oats and a gluten-free crumble, but you can serve them for dessert too.
5 from 2 votes
Print Pin Rate
Course: Breakfast
Cuisine: American
Keyword: Blueberry Oatmeal Crumble Bars
Prep Time: 10 minutes
Cook Time: 25 minutes
1 hour
Total Time: 35 minutes
Servings: 9
Calories: 324kcal
Author: Marly


Blueberry Filling

  • 3 cup blueberries , fresh or frozen
  • ½ cup water
  • 1 tablespoon agar agar flakes
  • 1 teaspoon lemon juice
  • ¼ cup agave nectar (or maple syrup/honey)

Oatmeal Crumble

  • cups rolled oats
  • 2 cups almond meal
  • 1 tablespoon ground flax meal
  • ½ teaspoon baking powder
  • ¼ teaspoon sea salt
  • ½ cup applesauce , unsweetened
  • cup agave nectar (or maple syrup/honey)
  • ¼ cup almond butter
  • ½ cup plant-based milk
  • teaspoon vanilla
  • 1 teaspoon apple cider vinegar


  • Heat your oven to 350F. Spray a 9X9 inch square baking dish with vegetable cooking spray.
  • Place blueberries in a saucepan. Add the water and agar flakes to the blueberry mixture and stir to combine. Bring this to a boil over medium high heat. Once it begins to boil, reduce heat to medium and simmer for about 5 minutes, stirring occasionally. Remove from heat.
  • Pour the lemon juice and agave in the blueberries. Stir to combine. Transfer to a bowl and refrigerate. 
  • Combine the oats, almond meal, flax meal, baking powder, and sea salt in a bowl. Stir to combine. Scoot the ingredients to one side of the bowl. In the other half of the bowl combine the applesauce, agave nectar, almond butter, milk, vanilla, and vinegar. Stir to combine. Then stir the wet and dry ingredients together. Add a tablespoon or two of water if necessary.
  • Take 3/4 of that oats mixture and press evenly across the bottom of your prepared pan. Set the rest of the batter aside.
  • Place the crust in the oven and bake for 15 minutes.
  • Remove crust from the oven. Check the blueberry filling. It should have thickened by now. Spread it over the baked crust.
  • Place dollops of the remaining crust batter distributed equally over the blueberry filling. Return to the oven and bake for 10 minutes, until the top crust turns golden brown. 
  • Remove from oven and set aside to cool before refrigerating to allow the filling to set completely.

Recommended Equipment

Nutrition Facts
Blueberry Oatmeal Crumble Bars
Amount Per Serving
Calories 324 Calories from Fat 153
% Daily Value*
Fat 17g26%
Saturated Fat 1g5%
Sodium 75mg3%
Potassium 202mg6%
Carbohydrates 36g12%
Fiber 6g24%
Sugar 17g19%
Protein 9g18%
Vitamin A 80IU2%
Vitamin C 6.1mg7%
Calcium 120mg12%
Iron 2.2mg12%
* Percent Daily Values are based on a 2000 calorie diet.

The nutrition information shown is an estimate provided by an online nutrition calculator and should not be considered a substitute for a professional nutritionist’s advice.


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4 Responses to Healthy Blueberry Crumble Bars Recipe

  1. You have apple cider vinegar listed in the ingredients but it’s not mentioned in the instructions. Does it go in the crust batter or in with the blueberries?

    • Hi Emjay! Thanks for your comment. The vinegar should have been included in the instructions. It’s fixed now. Thanks for letting me know about that!


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